I've been reading about what braxton hicks feels like and most say it feels like a general tightening and loosening of your belly. A few days ago I kind of sat up in a weird position and got a weird, but painless, feeling in my stomach. I touched it to rub it, and I noticed it was hard. A second or two later, it released and went back to normal. The same thing happened later that night but it hasn't happened since. Are these weird feelings normal and should they be happening irregularly like this?